The British concept, designed by UK firm Baca Architects, builds on these earlier ideas. Secured in place by four vertical posts sunk deep in the ground, the house resides partially submerged in the ground in a kind of dock lined with retaining walls and seated on a concrete slab. If floodwater begins to flow across the surface of the land, it is diverted down into this dock, where it begins to fill the chamber in which the house rests. The house itself is designed as a kind of free-floating pontoon, buoyed upward by hollow chambers made of wood and concrete. Secured in place by those four posts, the house can move vertically but not laterally, so it won't float away.